This study investigates the characteristics and fractionation of rare earth elements (REEs) in the weathered products of granite from South Bangka, Indonesia. Samples were collected from two drill holes (TBKP‐30 and TBKP‐38) at depths ranging from 0.5 to 18 m. Analytical methods, including X‐ray diffraction (XRD), X‐ray fluorescence (XRF), inductively coupled plasma mass spectrometry (ICP‐MS), and scanning electron microscopy (SEM‐EDS), were used to examine mineral compositions and REE distribution. The parent granite is an S‐type biotite granite with total REE concentrations between 1081 and 1279 ppm. The dominant REE‐bearing minerals are REE‐fluorocarbonates (synchysite, parisite) and REE‐phosphates (apatite, monazite, xenotime), accompanied by REE‐silicates (allanite, thorite, zircon). Fluorocarbonates (synchysite, parisite) occur filling grain boundaries of the parental granite, suggesting later overprinting. Monazite, xenotime, and zircon were identified as part of the crystal lattice of residual minerals in both weathered profiles. TBKP‐30, has significantly depleted in REEs with high intensity degree of weathering and the occurrence of gibbsite minerals. TBKP‐38, has cerium enrichment in the lower profile, caused by the fixation into cerianite and/or it is incorporation with Fe‐Mn hydr(oxides) along with the occurrence of kaolinite minerals. This study highlights the patterns of REE enrichment as a potential indicator of weathering intensity, providing insights crucial for the exploration of REE deposits and the development of sustainable extraction methods.
